code: def test_causal_refuter_placeholder_method():
      refuter = MockRefuter(
          None, IdentifiedEstimand(None, None, None), None
      )
      with pytest.raises(NotImplementedError):
          refuter.refute_estimate()
  
file_path: dowhy/tests/test_causal_refuter.py
imports: import numpy
  import pytest
  from flaky import flaky
  from dowhy.causal_estimator import CausalEstimate
  from dowhy.causal_identifier.identified_estimand import IdentifiedEstimand
  from dowhy.causal_refuter import CausalRefuter
label_desc: Use image node_id 1 for calling a global function with example usage: test_causal_refuter_placeholder_method() without return types